DIYbanter - View Single Post - 100v (japanese) to 120v (usa) on a capacitor motor

James Sweet

wrote:
hey smart people,
i have a japanese fan that i want to install in my attic on
thermostat. its from a clean room in japan, running on 100v. ive heard
that i can do this without a transformer, "it will just run hot".
is this true? is there a chance of fire? just how hot? will it likely
smoke in a week? or a year?
thank you

I would use a transformer. It can be done cheaply by wiring up a 120V to
24V power transformer in a buck configuration. You can get one of these
cheaply from anywhere that sells HVAC surplus. Just make sure the
secondary is rated to handle as much current as the motor draws, it does
not have to be a very big transformer because it is not powering the
full load of the fan.